Method and device for active load modulation by inductive coupling

摘要

The method involves extracting an antenna signal (AS) from a periodic signal i.e. external clock signal (CKe). Another periodic signal i.e. internal clock signal (CKs), is generated by an astable/digital type synchronous oscillator (SO). Bursts of the latter signal are applied to an inductive antenna circuit (ACT) to generate an active load modulation magnetic field (FLD2). The oscillator is placed in a synchronous oscillation mode before each application of one burst of the latter signal to the circuit. The oscillator is placed in a free oscillation mode during the application of the burst. Independent claims are also included for the following: (1) a device for transmitting and receiving data by inductive coupling (2) a device comprising a host processor.